CAREER: Experimental Studies of Granular Fluids

[874833] menoncareer项目包括颗粒材料动力学的实验研究。这项研究将寻求描述颗粒流动的数据。这些信息应该有助于颗粒系统模型的开发。目前，对于颗粒系统对外力的响应，还没有一个完善的流体力学描述。与传统的情况不同，空间结构和动态量的相关性可能在颗粒流动中起重要作用。理解这些相关性的第一步涉及研究和控制颗粒之间耗散相互作用的实验。同时，均匀激发的颗粒系统将通过重力驱动流和高振幅、高频振荡产生。这两个组成部分将结合在一起，以创建具有可调耗散的良好控制的均匀动力系统，通过视频显微镜，扩散波光谱，声音传播和直接应力测量来研究，以识别动力和空间相关性。研究计划的结构是为了在本科生研究中发挥重要作用。该计划的一些组成部分将转化为本科实验课程的模块。课程发展建议是建立在PI的研究兴趣和培训的基础上，以满足正在进行的本科课程重组的部门目标。这个CAREER项目包括对颗粒材料动力学的实验研究。在常规液体的流体力学水平上，对于颗粒系统对外力的响应还没有完善的描述。这个一般性问题引起了许多科学界的兴趣，包括化学和机械工程、地球物理学、应用数学以及物理学。与传统的流体流动不同，颗粒流动的空间结构和动态量的相关性可能起着非常重要的作用。提出的实验将研究能量损失可控的均匀颗粒流，使用各种光学技术，声音传播和力测量，以识别动态和空间相关性。研究计划的结构是在本科生研究中发挥重要作用，并为独立研究制定了明确的项目。该计划的一些组成部分被设计成本科实验课程的模块。课程发展建议是建立在PI的研究兴趣和培训基础上，以满足重要的部门目标，作为正在进行的本科课程重组的一部分。***

9874833MenonThis CAREER project comprises an experimental investigation of the dynamics of granular materials. The research will seek data describing granular flow. This information should aid development of models granular systems. At present there exists no well-established hydrodynamic description of the response of a granular system to external forces. Unlike the situation in conventional, correlations in spatial structure and dynamical quantities may play a significant role in granular flows. A first step to understanding these correlations involves experiments to study and control the dissipative interaction between grains. In parallel, homogeneously excited granular systems will be created via gravity-driven flow and high-amplitude, high-frequency oscillation. These two components will be united to create well-controlled uniform dynamical systems with tunable dissipation, to be studied by videomicroscopy, diffusing-wave spectroscopy, sound propagation and direct stress measurements with a view to discerning dynamical and spatial correlations. The research plan is structured to build in a significant role for undergraduate research. Some components of the program willdevolve into modules for undergraduate laboratory courses. Proposals for course development are defined which build on the research interests and training of the PI to meet departmental goals in an ongoing restructuring of the undergraduate program.%%%This CAREER project comprises an experimental investigation of the dynamics of granular materials. There exists no well-established description of the response of a granular system toexternal forces at the level of fluid mechanics for conventional liquids. This general question is of interest to a number of scientific communities including chemical and mechanical engineering, geophysics, applied mathematics as well as physics. Unlike the case of conventional fluid flows, correlations in spatial structure and dynamical quantities may play a very significant role in granular flows. The proposed experiments will study homogenous granular flows in which the energy losses are controllable, using a variety of optical techniques, sound propagation and force measurements with a view to discerning dynamical and spatial correlations. The research plan is structured to build in a significant role for undergraduate research with well-delineated projects for independent research. Some components of the program are designed to devolve into modules for undergraduate laboratory courses. Proposals for course development are defined which build on the research interests and training of the PI to meet significant departmental goals as part of an ongoing restructuring of the undergraduate program.***